Google added captions for over 500 videos from The Davos Debates. Try a search for captioned video on thedavosquestion to see some of the results. “To turn on captions, hover over the arrow-shaped icon in lower right corner of YouTube player and click caption button. Captions on The Davos Debates videos can also be automatically translated right in YouTube: choose "Translate Captions" from caption menu to try machine translation to 50 different languages,” revealed. More info: Davos Debates.
If you're not familiar with TED Conference “it’s an annual gathering of thought leaders from a variety of fields: science, music, education, health care, politics, environmentalism, entrepreneurialism, technology, design, and more. Goal of the conference's to share "ideas worth spreading."” “A few years back, TED organizers decided to share videos with the world, and we’re delighted that they host them on YouTube, as well as their own site, TED.com,” revealed. More info: TEDtalksDirector's Channel